noun.
An uncommon, white, vitreous natural fluoride of aluminum and sodium, Na3AlF6, nearly invisible in water in powdered form and used chiefly in the electrolytic recovery of aluminum.
The Century Dictionary and Cyclopedia
noun.
A fluorid of sodium and aluminium found in Greenland, where it forms an extensive bed.
the GNU version of the Collaborative International Dictionary of English
noun.
A fluoride of sodium and aluminum, found in Greenland, in white cleavable masses; -- used as a source of soda and alumina.
noun.
The mineral sodium aluminium fluoride (Na3AlF6).
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a white mineral consisting of fluorides of aluminum and sodium; a source of fluorine
Word Usage
"At the smelter, the aluminum oxide crystals are dissolved in a bath of something called cryolite (sodium aluminum fluoride) and zapped with enormous jolts of electricity (100,000 to 150,000 amps), which strips the oxygen from the aluminum."